Volume 18 No 9 (2020)
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Determination of Mercury in Sweet Gas by Atomic Absorption Spectrometry Using Gold Amalgam Collection: A Case Study in the North Gas Company, Iraq
Abdul Majeed K. Ahmed, Imad Tarek Hanoon, Tuana Khalil Abdulla
Abstract
Mercury is recognized as a metallic constituent in natural gas. It exists in natural gas (sweet gas is medial Output) and causes failure for some equipment in the lines products. So, it is necessary to determine the nanograms of mercury in sweet gas samples by using gold-amalgam collection and analysis by atomic absorption spectrometry (Vapor-method). In this method, the calibration curves are linear and ranging from 0.01 to 1000 ng of mercury. In sweet gas measurement, the range is wide enough for work with the correlation coefficient of 0.9999. The detection limit for the amalgam method (three times the standard deviation of a blank determination) is determined to be 0.003ng for samples of mercury. Vapor collected on sorbent tubes contained 80mg of porous gold-coated. The accuracy of this procedure is confirmed by determination of the standards taken form standard box of mercury MB-1 as unknown concentration. Finally, the range of mercury in sweet gas supposed to be from 2.48 - 8.9 nanogram per normal cubic meter.
Keywords
Mercury, Atomic Absorption Spectrometry, Gold-amalgam Collection.
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